On this date…March 4 launch of STS-62

#OTD in 1992…Discovery launched with the first International Microgravity Laboratory.

Today marks the 40th anniversary — July 20, 1976 — of the first U.S. robotic landing on another planet by the Viking 1 spacecraft on Mars.

As a dress rehearsal mission for the moon landing, Apollo 10 launched today in 1969 with Cernan, Young and Stafford